Small fish get stuck near the bottom of a shark and derives its nutrition from it. This kind of association is called as

In which of the following interactions both partners are adversely affected?

Statements

$I.$ Recent studies support competition as suggested in 'Gauses's Competitive Exclusion Principle'

$II.$ Gause's hypothesis says if two species compete for same resources then one will be eliminated by another species

$III.$ More recent studies point out that species facing competition might evolve mechanisms that promote co-existence rather than exclusion

$IV.$ Gause's competitive exclusion principle is effective when resources are in excess

$V.$ Unlimited resources give better opportunity for adaptation

Choose the correct combination of statements

In commensalism

Which competition is more intense?

Competition for food, light and space is most severe between two